Earthquakes

In earthquake terminology, how is a focus described?

• Energy of an earthquake carried away from the epicenter.

• The point beneath the Earth's surface where rock under stress breaks to cause an earthquake.

• The point on the surface directly above the origin of the earthquake.

What are the different kinds of seismic waves?

• Q, R, and S waves

• R, S, and surface waves

• P, S, and surface waves

How can the epicenter of an earthquake be characterized?

• A measurement of an earthquake's magnitude and its strength based on seismic waves and movement.

• The point on the Earth's surface directly above the focus.

• The point beneath the Earth's surface where rock under stress breaks to cause an earthquake.

How does the energy of an earthquake travel through the Earth?

• Seismic waves carry the energy of an earthquake away from the focus, through the Earth's interior, and across the surface.

• Seismic waves carry the energy of an earthquake toward the focus, through the Earth's interior, and across the surface.

• During an earthquake, seismic waves move toward the focus and epicenter then move out in all directions.

________ carry the energy of an earthquake away from the focus.

• Mercalli waves

• Richter waves

• Seismic waves

When considering the three types of seismic waves, which waves move more slowly than their counterparts yet produce the most severe ground movements?

• P waves

• S waves

• surface waves

These type of waves compress and expand the ground like an accordion.

• P waves

• S waves

• surface waves

Which waves vibrate from side to side and up and down?

• P waves

• S waves

• surface waves

When P and S waves reach the surface of the Earth, some are transformed into surface waves.

• True

• False

What instrument is used to measure and record the vibrations of seismic waves?

• Richter graph

• Seismograph

• Mercalli graph